cs5 activation

[errico]

Good afternoon, I'm trying to reinstall the old CS5 design standard suite. Not having the original .dmg I downloaded them through the link that Adobe provided to send me. Unfortunately, however, my serial number is not recognized at the installation. My Mac is very old, with a OS 10.7.5

[Test Screen Name]

Warning, scammers may contact you privately pretending to be Adobe staff. Adobe will never send you a private message asking you to email an account that isn't @adobe.com, or use Skype. Adobe never ask you for their password. These scammers want your Adobe info, credit cards, your money and control of your computer, please take care.

[Marianne-Deiters]

What is the error message?  "The serial number is not valid for this product"? Then this link could help: https://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html